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Homework Help: Check expression equivalent to

  1. Feb 27, 2005 #1
    sec theta - sec theta (sin^2 theta)

    =(1/cos theta) -(1/cos theta)(sin^2 theta)

    sin^2 theta = 1-cos^2 theta

    so after subbing this in I got

    -cos^2 theta/cos theta

    so an equivalent expression would be cos theta?
  2. jcsd
  3. Feb 28, 2005 #2
    Looks fine to me, although where you have -cos^2 θ/cos θ, there shouldn't be a -ve sign.
  4. Feb 28, 2005 #3


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    Homework Helper

    You should have factored [itex] \frac{1}{\cos \theta} [/itex] and then it would have more clear...Yes,the final answer is [itex] \cos\theta[/itex].

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